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Dementia: 10-year risk estimates may inform prevention

A large study provides 10-year absolute estimates for dementia risk. The scientists hope that by identifying people at high risk, specialists might be able to put in place early strategies for prevention.

Recent studies have also found that biological sex and a particular variation in the APOE gene — the e4 allele — both affect a person's overall risk.

The APOE gene encodes apolipoprotein E, a protein that plays a vital role in regulating cholesterol levels, and which may also be key in reducing the levels of the protein beta-amyloid, which can form toxic plaques in the brain.

A team at the Copenhagen University Hospital in Denmark believes that if we can identify people at the highest risk for dementia early on and understand what places them at such a high risk, we may also be able to implement appropriate preventive measures.

The researchers conducted a large population study in order to calculate the 10-year absolute risk estimates for dementia based on age, sex, and the existence of the e4 allele of the APOE gene.

Study co-author Prof. Ruth Frikke-Schmidt and colleagues published their results in the Canadian Medical Association Journal.

"If those individuals at highest risk can be identified," she goes on, "a targeted prevention with risk-factor reduction can be initiated early before disease has developed, thus delaying onset of dementia or preventing it."

Following their analysis, Prof. Frikke-Schmidt and her colleagues revealed that a combination of three factors — biological sex, advancing age, and the APOE gene variation — appear to mark groups that are at high risk of developing dementia.

In terms of age and sex, the scientists determined a 7 percent risk for women in their 60s and a 6 percent risk for men at the same age, while women in their 70s have a 16 percent risk and men experience a 12 percent risk at that point.

When people reach age 80 or older, risk increases even more for both women and men, arriving at 24 percent and 19 percent, respectively.

In their paper, the researchers conclude that:

"The present absolute 10-year risk estimates of dementia by age, sex, and common variation in the APOE gene have the potential to identify high-risk individuals for early targeted preventive interventions."

However, they also warn that the estimates provided in the recent study are only for individuals of white European descent and therefore may not apply to other populations.

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